It seems like alot of you guys are talking about the corrosin characteristics of the powder as a reason to clean and reload.
Actually my main reason to load a cold bore barrel every day is because of moisture. Especially if you bring your rifle inside and out. Or if it is snowing or raining. Our MZ seasons are usually pretty wet here in WV. And condensation is what concerns me the most about leaving a rifle loaded over night or longer.
I know for sure that if I left it loaded I would leave my rifle in the back of my truck. And would not allow it to be subjected to any heat or additional moisture. Just an opinion. Tom.